GIA has calculated the cut results for 38.5 million proportion sets based on the assessment of seven components.
first three — Brightness, Fire, and Scintillation — are
appearance-based aspects. The remaining four — Weight
Ratio, Durability, Polish, and Symmetry — are related
to a diamond's design and craftsmanship.
In the GIA Diamond Cut Grading System, each component was assessed individually, taking into account the relative importance of that component in the overall cut quality of a round brilliant diamond, and the ability of an average, experienced observer to consistently see the differences in cut quality based on these components.